Metal fatigue is obvious Engine explosion on United Airlines flight over Denver on Saturday, Robert Samwalt, chairman of the National Transportation Safety Board, said at a virtual press conference on Monday night. The explosion of Flight 328 caused debris from the Pratt & Whitney PW4000 engine casing to fall into the suburbs.
According to CBS Denver According to Samwalt, the engine was so shocking that it began to vibrate about four minutes after taking off from Denver International Airport. At that time, he said the plane was about 12,000 feet above the house.
Sumwalt said the two fan blades of the engine broke. One is the base that contacts the hub and the other is broken in the middle. He said the first blade caused “overload damage” on the second blade.
One of the blades was found on the soccer field.
According to Sam Walt, investigators try to determine how long the blade has been tired.
According to Federal Aviation Administration records, the plane involved was nearly 26 years old. CBS Denver saysHowever, FAA and NTSB officials said it was not possible to determine whether the failed engine was the original part or was later installed.
A new photo taken by CBS Denver on Saturday after the plane returned to Denver Airport shows a gaping hole under the right wing, with some engine debris colliding with the plane itself. Suggests.
Samwalt admitted that the aircraft’s fuselage had been damaged, but said the damage was not structural. The damaged part is a composite fairing that smoothes the plane and improves aerodynamics.
According to Sam Walt, the fire handle in the cockpit was activated and the two fire bottles of the engine were ejected. He said the flow of fuel was stopped, and investigators would investigate what continued to fuel the fire despite the precautionary measures taken.
Inspection of an engine involves examining its maintenance history.
Sumwalt added that the agency will compare this event to other events in the past.
“Our mission is to understand why it happened, not just what happened, and prevent it from happening again,” Sumwalt emphasized.
Over 200 passengers were on the plane to Hawaii. No one was injured on the plane or on the ground. The aircraft returned safely to the airport about 20 minutes after takeoff.
The Denver case followed the Japan Airlines 777 with the same type of engine and the December case, which included a United Airlines engine problem in February 2018.
“The three cases may have a common theme, but we won’t know until the investigation is complete,” said Scott Hamilton of aviation news site Reham News.
Boeing said Monday that all 777s powered by the same Pratt & Whitney engine landed around the world in the wake of Saturday’s emergency landing. 69 were up and 59 were stored.
In addition to United, which suspended 24 aircraft, the affected airlines included Japan Airlines, All Nippon Airways, Asiana Airlines of South Korea, and Korean Air.
The Egyptian state newspaper Al-Ahram reported on Monday that Egyptair, a state-owned airline, has grounded four planes with Pratt & Whitney’s engine.
British Secretary of Transportation Grant Shapps has announced that it will temporarily ban jet aircraft with Pratt & Whitney 4000-112 series engines from entering British airspace.
— Agence France-Presse contributed to this report..
The NTSB chief said metal fatigue appeared to have contributed to the United Airlines engine explosion over Denver.
Source link The NTSB chief said metal fatigue appeared to have contributed to the United Airlines engine explosion over Denver.